I don't have one of these power supplies personally just in the interests of those who do...
Would it not be possible to add support for it but leave it disabled by default. For advanced users have an option somewhere to enable this (options window, ini file edit, whatever).
Option 2 - If the CorsairLink software is installed, I'm sure it runs as a system service. Check to see if the service is running (or if the application process is running) - if so, don't try to read values. Display a window (such as the slow sensor window I get on my Dell laptops) that says CorsairLink is running, disabling readings.... etc.
This could be a good opportunity to build the framework into HWInfo to check for conflicting software. Not just for CorsairLink but for any other tools monitoring other sensors today and in the future.